The R and S genes are linked and 10 map units apart. In the cross R s / r S × r s / r s what percentage of the progeny will be R s / r s?
A) 5%
B) 10%
C) 25%
D) 40%
E) 45%
E) 45%
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In allopatric speciation, daughter species usually form
a. abruptly. b. in proportion to the parental stock. c. rapidly, but are then reduced by environmental factors. d. gradually over rather long periods of time. e. in the same homeland.
Amphibians are most dependent on an aquatic environment for ____
a. respiration b. feeding c. reproduction d. urination e. defecation
In human prenatal development, cleavage occurs in the ____
a. cervix b. upper part of the uterus c. vagina d. oviduct e. ovary
In chemiosmosis, what is the most direct source of energy that is used to convert ADP + i to ATP?
A) energy released as electrons flow through the electron transport system B) energy released from substrate-level phosphorylation C) energy released from movement of protons through ATP synthase, down their electrochemical gradient D) No external source of energy is required because the reaction is exergonic.